add support for reverse dependencies of installed modules (WIP)

easybuild/main.py

@@ -55,7 +55,7 @@
 from easybuild.framework.easyconfig.tweak import obtain_ec_for, tweak
 from easybuild.tools.config import find_last_log, get_repository, get_repositorypath, build_option
 from easybuild.tools.containers.common import containerize
-from easybuild.tools.docs import list_software
+from easybuild.tools.docs import list_software, list_reverse_dependencies
 from easybuild.tools.filetools import adjust_permissions, cleanup, write_file
 from easybuild.tools.github import check_github, find_easybuild_easyconfig, install_github_token
 from easybuild.tools.github import close_pr, list_prs, new_pr, merge_pr, update_pr
@@ -246,6 +246,9 @@ def main(args=None, logfile=None, do_build=None, testing=False, modtool=None):
         detailed = options.list_installed_software == 'detailed'
         print(list_software(output_format=options.output_format, detailed=detailed, only_installed=True))
 
+    elif options.list_reverse_dependencies:
+        print(list_reverse_dependencies(output_format=options.output_format))
+
     elif options.list_software:
         print(list_software(output_format=options.output_format, detailed=options.list_software == 'detailed'))
 
@@ -254,6 +257,7 @@ def main(args=None, logfile=None, do_build=None, testing=False, modtool=None):
         options.check_github,
         options.install_github_token,
         options.list_installed_software,
+        options.list_reverse_dependencies,
         options.list_software,
         options.close_pr,
         options.list_prs,

easybuild/tools/docs.py

@@ -61,6 +61,7 @@
 from easybuild.tools.filetools import read_file
 from easybuild.tools.modules import modules_tool
 from easybuild.tools.ordereddict import OrderedDict
+from easybuild.tools.run import run_cmd
 from easybuild.tools.toolchain import DUMMY_TOOLCHAIN_NAME
 from easybuild.tools.toolchain.utilities import search_toolchain
 from easybuild.tools.utilities import import_available_modules, quote_str
@@ -707,6 +708,44 @@ def list_software_txt(software, detailed=False):
     return '\n'.join(lines)
 
 
+def gather_reverse_dependencies():
+    """
+    Gather reverse dependencies from installed modules.
+
+    :return: dictionary with reverse dependencies
+    """
+    reverse_dependencies = {}
+
+    module_avail_cmd = "module -t avail 2>&1 | grep -v ':$'"
+    module_purge_load_list_cmd = "module purge; module load %s; module -t list 2>&1 | grep -v %s"
+
+    available_modules, _ = run_cmd(module_avail_cmd)
+
+    for module in available_modules.splitlines():
+        dependencies, _ = run_cmd(module_purge_load_list_cmd % (module,module))
+        for dependency in dependencies.splitlines():
+            if dependency not in reverse_dependencies:
+                reverse_dependencies[dependency] = []
+            reverse_dependencies[dependency].append(module)
+
+    return reverse_dependencies
+
+
+def list_reverse_dependencies(output_format=FORMAT_TXT):
+    """
+    Show reverse dependencies of installed software
+
+    :param output_format: output format to use
+    :return: multi-line string presenting requested info
+    """
+
+    reverse_dependencies = gather_reverse_dependencies()
+
+    #TODO: format output
+
+    return reverse_dependencies
+
+
 def list_toolchains(output_format=FORMAT_TXT):
     """Show list of known toolchains."""
     _, all_tcs = search_toolchain('')

easybuild/tools/options.py

@@ -558,6 +558,8 @@ def informative_options(self):
                                 'choice', 'store_or_None', 'simple', ['simple', 'detailed']),
             'list-installed-software': ("Show list of installed software", 'choice', 'store_or_None', 'simple',
                                         ['simple', 'detailed']),
+            'list-reverse-dependencies': ("Show list of reverse dependencies of installed software", 'choice', 'store_or_None', 'simple',
+                                        ['simple', 'detailed']),
             'list-software': ("Show list of supported software", 'choice', 'store_or_None', 'simple',
                               ['simple', 'detailed']),
             'list-toolchains': ("Show list of known toolchains",